Green, A. H. Geology of coal.--Miall, L. C. Coal plants. Animals of the coal measures.--Thorpe. T. E. Chemistry of coal.--Rücker, A. W. Coal as a source of warmth and power.--Marshall A. The coal question
Evidence reported by ian white for item coalitshistoryus00thorrich on February 8, 2007: no visible notice of copyright; stated date is 1878.